Gravitational Force: A very dense 1500-kg point mass (A) and a dense 1200-kg point mass (B) are held in place 1.00 m apart on a frictionless table. A third point mass is placed between the other two at a point that is 20.0 cm from B along the line connecting A and B. When the third mass is suddenly released, find the magnitude and direction (toward A or toward B) of its initial acceleration. (G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?
1.8 × 10-6 m/s2, toward B
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A) age B) density C) composition D) mass
Which of the following statements is true?
a. For an object at a concave mirror's center of curvature, the image is real and upright. b. For an object in front of a convex mirror, the image is always virtual and upright c. As an object approaches the focal point of a concave mirror, the image size shrinks to zero. d. All of the above statements are true.
When light in air strikes the flat surface of a certain glass at 31.2° with the normal, the reflected ray is 100 percent polarized. What is the critical angle for the air-glass interface of this glass?
A) 52.7° B) 21.4° C) 68.6° D) 58.8° E) 37.3°
According to astronomers, the Milky Way is _____
A) wheel shaped B) hexagonal C) rectangular D) bell shaped